#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main() 
{
	int count = 0;
	for (int i = 1; i <= 100; i++)
	{
		if (i % 10 == 9)
		{
			count++;
		}
		if (i / 10 == 9)
		{
			count++;
		}
	
	}
	printf("%d",count);
}